Let's get this math done. We have 666 and we're going to multiply it by 80. This is the same as taking 666 and adding it to itself 80 times.
Step 1: 0 + 666 = 666
Step 2: 666 + 666 = 1332
Step 3: 1332 + 666 = 1998
Step 4: 1998 + 666 = 2664
Step 5: 2664 + 666 = 3330
Step 6: 3330 + 666 = 3996
Step 7: 3996 + 666 = 4662
Step 8: 4662 + 666 = 5328
Step 9: 5328 + 666 = 5994
Step 10: 5994 + 666 = 6660
Step 11: 6660 + 666 = 7326
Step 12: 7326 + 666 = 7992
Step 13: 7992 + 666 = 8658
Step 14: 8658 + 666 = 9324
Step 15: 9324 + 666 = 9990
Step 16: 9990 + 666 = 10656
Step 17: 10656 + 666 = 11322
Step 18: 11322 + 666 = 11988
Step 19: 11988 + 666 = 12654
Step 20: 12654 + 666 = 13320
Step 21: 13320 + 666 = 13986
Step 22: 13986 + 666 = 14652
Step 23: 14652 + 666 = 15318
Step 24: 15318 + 666 = 15984
Step 25: 15984 + 666 = 16650
Step 26: 16650 + 666 = 17316
Step 27: 17316 + 666 = 17982
Step 28: 17982 + 666 = 18648
Step 29: 18648 + 666 = 19314
Step 30: 19314 + 666 = 19980
Step 31: 19980 + 666 = 20646
Step 32: 20646 + 666 = 21312
Step 33: 21312 + 666 = 21978
Step 34: 21978 + 666 = 22644
Step 35: 22644 + 666 = 23310
Step 36: 23310 + 666 = 23976
Step 37: 23976 + 666 = 24642
Step 38: 24642 + 666 = 25308
Step 39: 25308 + 666 = 25974
Step 40: 25974 + 666 = 26640
Step 41: 26640 + 666 = 27306
Step 42: 27306 + 666 = 27972
Step 43: 27972 + 666 = 28638
Step 44: 28638 + 666 = 29304
Step 45: 29304 + 666 = 29970
Step 46: 29970 + 666 = 30636
Step 47: 30636 + 666 = 31302
Step 48: 31302 + 666 = 31968
Step 49: 31968 + 666 = 32634
Step 50: 32634 + 666 = 33300
Step 51: 33300 + 666 = 33966
Step 52: 33966 + 666 = 34632
Step 53: 34632 + 666 = 35298
Step 54: 35298 + 666 = 35964
Step 55: 35964 + 666 = 36630
Step 56: 36630 + 666 = 37296
Step 57: 37296 + 666 = 37962
Step 58: 37962 + 666 = 38628
Step 59: 38628 + 666 = 39294
Step 60: 39294 + 666 = 39960
Step 61: 39960 + 666 = 40626
Step 62: 40626 + 666 = 41292
Step 63: 41292 + 666 = 41958
Step 64: 41958 + 666 = 42624
Step 65: 42624 + 666 = 43290
Step 66: 43290 + 666 = 43956
Step 67: 43956 + 666 = 44622
Step 68: 44622 + 666 = 45288
Step 69: 45288 + 666 = 45954
Step 70: 45954 + 666 = 46620
Step 71: 46620 + 666 = 47286
Step 72: 47286 + 666 = 47952
Step 73: 47952 + 666 = 48618
Step 74: 48618 + 666 = 49284
Step 75: 49284 + 666 = 49950
Step 76: 49950 + 666 = 50616
Step 77: 50616 + 666 = 51282
Step 78: 51282 + 666 = 51948
Step 79: 51948 + 666 = 52614
Step 80: 52614 + 666 = 53280

So, 666*80 = 53280